This is YAJTL (Yet Another Javascript Testing Library.) It's designed to
test client-side libraries without a browser, while still supporting
async behavior when mocking that out is just too complicated.

It's pretty much just a wrapper around existing tools like JSDom and NodeUnit.

The binary may be in different places depending on how you installed
it, so the path could be ./node_modules/.bin/nodeunit , or it might
be globally available as nodeunit, or even something hideous like
./node_modules/justtest/node_modules/.bin/nodeunit.